<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
<div id="app">
    <button @click="clickbtn">加{{count}}</button>
</div>

<script src="node_modules/vue/dist/vue.js"></script>
<script>
    var vm = new Vue({
        el:"#app",
        data:{
            count:0
        },
        methods: {
            clickbtn:function(){
                this.count += 1;
            }
        }
    })
</script>

</body>
</html>